| use crate::spec::LinkSelfContainedDefault; |
| use crate::spec::{add_link_args, crt_objects}; |
| use crate::spec::{cvs, Cc, DebuginfoKind, LinkerFlavor, Lld, SplitDebuginfo, TargetOptions}; |
| use std::borrow::Cow; |
| |
| pub fn opts() -> TargetOptions { |
| let mut pre_link_args = TargetOptions::link_args( |
| LinkerFlavor::Gnu(Cc::No, Lld::No), |
| &[ |
| // Enable ASLR |
| "--dynamicbase", |
| // ASLR will rebase it anyway so leaving that option enabled only leads to confusion |
| "--disable-auto-image-base", |
| ], |
| ); |
| add_link_args( |
| &mut pre_link_args, |
| LinkerFlavor::Gnu(Cc::Yes, Lld::No), |
| &[ |
| // Tell GCC to avoid linker plugins, because we are not bundling |
| // them with Windows installer, and Rust does its own LTO anyways. |
| "-fno-use-linker-plugin", |
| "-Wl,--dynamicbase", |
| "-Wl,--disable-auto-image-base", |
| ], |
| ); |
| |
| // Order of `late_link_args*` was found through trial and error to work with various |
| // mingw-w64 versions (not tested on the CI). It's expected to change from time to time. |
| let mingw_libs = &[ |
| "-lmsvcrt", |
| "-lmingwex", |
| "-lmingw32", |
| "-lgcc", // alas, mingw* libraries above depend on libgcc |
| // mingw's msvcrt is a weird hybrid import library and static library. |
| // And it seems that the linker fails to use import symbols from msvcrt |
| // that are required from functions in msvcrt in certain cases. For example |
| // `_fmode` that is used by an implementation of `__p__fmode` in x86_64. |
| // The library is purposely listed twice to fix that. |
| // |
| // See https://github.com/rust-lang/rust/pull/47483 for some more details. |
| "-lmsvcrt", |
| "-luser32", |
| "-lkernel32", |
| ]; |
| let mut late_link_args = |
| TargetOptions::link_args(LinkerFlavor::Gnu(Cc::No, Lld::No), mingw_libs); |
| add_link_args(&mut late_link_args, LinkerFlavor::Gnu(Cc::Yes, Lld::No), mingw_libs); |
| // If any of our crates are dynamically linked then we need to use |
| // the shared libgcc_s-dw2-1.dll. This is required to support |
| // unwinding across DLL boundaries. |
| let dynamic_unwind_libs = &["-lgcc_s"]; |
| let mut late_link_args_dynamic = |
| TargetOptions::link_args(LinkerFlavor::Gnu(Cc::No, Lld::No), dynamic_unwind_libs); |
| add_link_args( |
| &mut late_link_args_dynamic, |
| LinkerFlavor::Gnu(Cc::Yes, Lld::No), |
| dynamic_unwind_libs, |
| ); |
| // If all of our crates are statically linked then we can get away |
| // with statically linking the libgcc unwinding code. This allows |
| // binaries to be redistributed without the libgcc_s-dw2-1.dll |
| // dependency, but unfortunately break unwinding across DLL |
| // boundaries when unwinding across FFI boundaries. |
| let static_unwind_libs = &["-lgcc_eh", "-l:libpthread.a"]; |
| let mut late_link_args_static = |
| TargetOptions::link_args(LinkerFlavor::Gnu(Cc::No, Lld::No), static_unwind_libs); |
| add_link_args( |
| &mut late_link_args_static, |
| LinkerFlavor::Gnu(Cc::Yes, Lld::No), |
| static_unwind_libs, |
| ); |
| |
| TargetOptions { |
| os: "windows".into(), |
| env: "gnu".into(), |
| vendor: "pc".into(), |
| // FIXME(#13846) this should be enabled for windows |
| function_sections: false, |
| linker: Some("gcc".into()), |
| dynamic_linking: true, |
| dll_tls_export: false, |
| dll_prefix: "".into(), |
| dll_suffix: ".dll".into(), |
| exe_suffix: ".exe".into(), |
| families: cvs!["windows"], |
| is_like_windows: true, |
| allows_weak_linkage: false, |
| pre_link_args, |
| pre_link_objects: crt_objects::pre_mingw(), |
| post_link_objects: crt_objects::post_mingw(), |
| pre_link_objects_self_contained: crt_objects::pre_mingw_self_contained(), |
| post_link_objects_self_contained: crt_objects::post_mingw_self_contained(), |
| link_self_contained: LinkSelfContainedDefault::InferredForMingw, |
| late_link_args, |
| late_link_args_dynamic, |
| late_link_args_static, |
| abi_return_struct_as_int: true, |
| emit_debug_gdb_scripts: false, |
| requires_uwtable: true, |
| eh_frame_header: false, |
| // FIXME(davidtwco): Support Split DWARF on Windows GNU - may require LLVM changes to |
| // output DWO, despite using DWARF, doesn't use ELF.. |
| debuginfo_kind: DebuginfoKind::Pdb, |
| supported_split_debuginfo: Cow::Borrowed(&[SplitDebuginfo::Off]), |
| ..Default::default() |
| } |
| } |